Nodejs, Mongodb and Promises

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Nodejs, Mongodb and Promises

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#1 by (2 votes)

1

I need to know how to execute Nodejs in a correct and orderly way:

Connect with Mongo.

Execute query (Insert, Select, Update, Delete)

Return results

Close connection.

My idea is that whenever you need to make a query, call the connection, run the query and return the data and close it (so you would have the possibility to make many queries using a single connection). Following the manual of Mongodb I did the following but I do not know how to order myself:

var MongoClient = require('mongodb').MongoClient;

var url = 'mongodb://localhost:27017/miConeccion';
function ConectarMongo(){
var promesa = new Promise(function(resolve, reject) {
        MongoClient.connect(url, function(err, db) {
            if(err){
                reject(err);
                return;
            }
            resolve(db)
        });
});
return promesa;
}

var conexion = ConectarMongo();
conexion.then(
    function(db){
        return db;
    },
    function(err){
        console.log("Hemos fallado en la conexión");
    }
);

mongodb nodejs promesas

asked by Ricky 16.05.2017 в 07:17

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1 answer

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score 2 · Answer 1

Lately I'm answering my own questions, well here's the solution, I've already testified:

var MongoClient = require('mongodb').MongoClient;

var url = "mongodb://localhost:27017/miConeccion";

var Conectar = function(){
return new Promise( function( resolve, reject ) {
    MongoClient.connect(url, function( err, db ) {
        if(err) reject(err);
        db.collection("usuarios").findOne({}, function(err, result){
            // console.log( result )
            resolve(result);
            db.close();
        });
    });
});
}

Conectar()
.then(function( result ) {
    console.log( result );
});

My source was the following answer: link

I hope you serve someone.